Commutating dynamo-electric machine



APPLICATION FILED APR.9. 1920.

Patented Feb. 22,1921.

" UNITE STATES, "PATENT, osl=- 1cs. 7

mawm o. rnnvm, or Rosanna. NEW Imam, assmnoa ro zonnm. 'amc'rmc Moron CORPORATION, or-oanwoon, new smut, a conronnm or NEW YORK.

COMHU'IATING Dynamo-anaemic macnnm To all whom it may concern:

Be it known that I, EDWARD G. Panvm, a citizen of the United States, and resident of Roselle, in the county of Union and State armature coilare spaced apart on the circumference of the armature by an angle less than the angle between adjacent main exciting poles of the machine.

The various features of novelty which characterize my invention are pointed out with and orming a part of this specification. For a better understanding of the invention, however, and the advantages possessed by it reference should be had to the accomanying drawings and descriptive matter in which I have illustrated and descmbed preferred embodiments of my invention. Of the drawings; v Figure 1 is a somewhat dlagrammatlc end view of a bipolar machine.

Fig. 2 is a view taken similarly to Fig. 1 illustrating a modification;

And .Fig. 3 is a diagrammatic end view of a multipolar machine.- v

In the drawings, and referring first to the construction shown in Fig. 1, A represents the field ring of a bipolar dynamo electric machine which may be either a motor or a generator, and'is, except for the speclal 1nterpole arran ment, of conventional type. The field ring is provided with two diametrically opposed main exciting poles B, and with an interpole C. The armature D s shown as slotted at D to receive the armature windings, of which only the two coils E and EA, undergoing commutation are shown. F represents the commutator of the machine, and G the collecting brushes. The two sides of each armature coil are separated by an angle S, measured about the articularity in the claim annexed to v Specification 01' Letters Patent. Patent d F b. 22 1921 Application filed April 9, 1820. SerIaLJI'o. 872,554.

armature shaft, which is substantially less Ehan the 180 iangle biatween the axes of the we mam excl in po es B. In con uence the collsE and EIAdo not come ibiether but have their ad acent sides so aratedby an angle of some magnitude. e core of th e interpole C comprisesya spool portion 0 surrounded'by theenergizmg winding the two coils E and EA, once during each The exciting winding H for the interpole C is connected rotation of the armature.

in series with the armature. @The exciting windingslfor the main poles B may be connected in shunt to the armature or may be energized in any other suitable manner.

. Those skilled in the art will readily see that the special construction shown in Fig. '1 possesses certain im ortant practical advantages. The use of t e short chord armature windings shortens the coils and thereby reduces the amount of copper required in a machine of given output, while the proper commutating field to prevent s arking is impressed on each armature coily a si le interpole structure with a minimum weig t of copper and magnetic material for this purpose.

, It will be obvious, to these skilled in the art that where, for an reason, it is desired to subject each side 0 each coil undergoing commutation to the action of a suitable commutating field, my special interpole construction may be employed to do this. For example with such a bipolar machine as is shown in Fig. 1, it is only necessary to add a second interpole CA similar to the pole C as shown in Fig. 2. The pole CA is diametrically opposed to the pole C, and its winding H is connected in series withthe winding H of the pole C.

In F1g. 3 I have illustrated the use of my invention in a multipolar machine. As shown in Fig. 3, the tipposite sides of each of the four coils F, F and F, simultaneousl undergoing commutation, are se arated rom one another by an angle su stantially less than the angle of 90 between each ad acent pair of main exciting poles B. As shown in Fig. 3 there are two diametrically opposed commutating poles CB and CB, each of which may be identical with the interpole C of the construction first described. One pole face portion C of the pole CB acts on one side of the coil F while the other pole face portion G acts on the adjacent side of the coil F". The two pole face portions C of the interpole CB act simultaneously upon the adjacent sides of the coils F and F. As shown in Fig. 3 the diametrically opposed brushes are connected together, and the windings H for the two interpoles are connected in series with the armature.

While in accordance with the provisions of the statutes, 1 have illustrated and described the best forms of my invention now known to me, it will be apparent to those skilled in the art that changes may be made in the form of the apparatus disclosed without departing from the spirit of my invention, as set forth in the appended. claim.

Having now described my invention, what- I claim as new and desire to secure by Letters Patent, is:

The combination in a dynamo electric machine, of an armature having a short chord drum winding, a commutator, collecting brushes, a field magnet having a pair of main exciting poles of opposite polarity, and an interpole structure between said main poles, and consisting of a core comprising a spool portion and a polar portion, the latter being shaped to provide two pole faces spaced apart circumferentially of the armature to act simultaneously on coils of said drum wlnding connected to brushes of opposite polarity, and an exciting winding surrounding said spool and in series with said armature.

Signed at New York in the county of New York and State of New York this th day of March A. D. 1920.

EDWARD G.. PARVIN. 

